Tag Archives: heart rate test

Over the past two weeks I have outlined how to conduct a heart rate test and a functional threshold power test; but, I realized that I should have started from the beginning. What are the various training metrics that a triathlete should use?

Let’s look at a few key metrics that any triathlete or endurance sport athlete should understand, or at least a basic understanding.

Heart Rate – The very basic definition of a heart rate is the number of heartbeats per unit of time. Heartbeats are created when blood flows through the heart and the values open and close creating an audible sound. The normal human heart beats at 60-100 beats per minute (bpm). This, of course, depends on various factors such as fitness, age, stress, etc. Heart rate in fitness is an important metric because it can measure an athlete’s fitness. Through regular endurance training, the heart becomes stronger and thus can pump more blood with each beat. As a result, the heart doesn’t have to work as hard, and the athlete’s heart rate at rest and during exercise will be lower. Measuring an athlete’s heart rate over time is a good way to measure improvement in an athlete’s endurance fitness. See how to conduct a heart rate test for more information on heart rate-based training.

Cardiac Output – Cardiac output is measured as the amount of blood that the heart pumps through the body at a single minute. An increase in cardiac output is important because more blood is delivered to the important organs, such as the brain and liver. Cardiac output increases with regular endurance training. During endurance sports, cardiac output is an important metric because it means that more blood is delivered to the working skeletal muscles during a workout. As a result, more oxygen is transported to the muscle cells to produce energy and other metabolic waste by-products are removed from the working muscles more rapidly.

VO2max – Endurance training not only improves cardiovascular fitness, but also improves lung capacity during exercise. Endurance training generally improves an athlete’s respiratory rate (breathes per minute) and tidal volume (amount of air per breath). Improvements in respiratory rate and tidal volume can contribute to an increase in maximal oxygen uptake, also known as VO2max. VO2max is defined as the highest volume of oxygen that a person’s body is capable of taking in and using during aerobic energy production. An improvement in VO2max is important for endurance athletes because it means more oxygen is available to working muscles for energy production during exercise.

Lactate Threshold – Lactate threshold represents the point at which the athlete’s body requires a greater contribution from the glycolysis energy system (anaerobic system) and a smaller contribution from the oxidative phosphorylation energy system (aerobic system). At this point, lactate production exceeds the lactate removal rate and blood lactate levels increase. One of the primary goals of endurance training should be to increase an athlete’s lactate threshold.

Power – Power is primarily a cycling metric. It is simply defined as the rate of doing work, where work is equal to force times distance. Power is measured via a power meter on a bike. See How to Conduct a Functional Threshold Power test for more information on power-based training.

Rate of Perceived Effort – Rate of Perceived Effort, or RPE, is a psychophysiological scale, meaning that it calls on the mind and body to rate one’s perception of effort. The traditional scale called the Borg Scale is based on a scale of 6-20, where a score of 6 is equivalent of no exertion and a score of 20 is equivalent of maximum exertion. Many coaches and trainers, myself included, will use a scale of 1-10 for easier understanding by the athlete/client.

Above are several common exercise physiology and training metrics terminology that are often thrown around by athletes, coaches, and endurance sport authors. Of course, there are many more that we could discuss.

Why do a majority of endurance sport coaches want/require you to train with a Heart Rate (HR) monitor?

It’s a great question! I know a lot of athletes who have fancy Garmin watches who don’t wear their straps. Personally, I think they are making a big mistake here. Now, HR isn’t a 100% accurate and there is certainly some day-to-day variability (i.e., heat, stress, time of day, etc.); but, overall, HR training is effectivearv

Why should you wear that annoying little strap that is probably chafing your skin? Here are some good reasons:

Wearing a HR strap ensures that your easy days are easy and your hard days are hard. Most athletes (myself included) have a tendency to work too hard on easy days and not hard enough on hard days. By knowing your HR zones you can ensure that you are working at the correct intensity levels to ensure the best physiological adaptations in your body.

Wearing a HR strap will aid you in determining what level of intensity you should be working at during exercise. We’ll discuss HR zones later below, but each HR zone specializes and trains different physiological adaptations and metabolic pathways in the body. For example, if you want to improve aerobic or endurance fitness then you should train primarily in Zone 2 (at or below aerobic threshold).

Wearing a HR strap can help you lose weight and “teach” your body to utilize fat for fuel. Now, we should emphasize the word “can.” Everyone’s metabolism is slightly different and not everyone will have the same results. While working at a lower intensity, HR between 55-65% of maximal HR, the body will utilize more fat molecules to fuel the body instead of glycogen. This is important for long-course triathletes. Staying in lower intensities will allow the body to use more fat vs glycogen (carbs) since fat is essentially an infinite fuel source vs. glycogen, which is a finite fuel source. Note: If you are not an endurance athlete and looking to lose weight, then you want to utilize a different method. We’ll discuss that another time.

As I mentioned above, there are HR zones. Depending who you ask, there may be slightly different versions of the HR Zones. Below is what I use with my athletes:

You might also see zones broken down by lactate threshold. Lactate threshold is the point in training intensity where lactic acid (or commonly called lactate) starts to accumulate in the bloodstream. In a nutshell, lactic acid is a by-product of metabolism at certain exercise intensities.

In order to determine an athlete’s HR zones, an athlete must undergo a Maximal Heart Rate Test. These, of course, can be done in the laboratory setting, but most athletes don’t have the time or money to do so. A field test works for most people.

You’ve probably read in a billion books and magazines that you can calculate your HR using a simple mathematical formula. You can, but, it’s not the most accurate, because the results can vary due to genetic differences between individuals and also between different activities. However, if you’re interested you can calculate your MHR using Karvonen’s Formula:

MHR = 220 – age or

The newer gender specific calculation:

Male = 214 – (0.8xage)

Female = 209 – (0.9xage)

For a more accurate test, I suggest conducting a Maximal Heart Rate Test for each running and cycling. Generally, your MHR will be about 5 beats per minute (bpm) higher during running than cycling.

Disclaimer: Heart rate tests are very stressful on the body. PLEASE get cleared by your medical provider before attempting any HR testing. This is especially important if you have any known heart conditions. Attempt at your own risk.

Here is the below protocol I generally use with my athletes for both cycling and running.

5 minutes – warm up slowly to a pace where at the end you breathe a little hard, but are able to complete a full sentence without grasping for air

5 minutes – maintain pace, but increase a bit during the less 60-90 seconds

2 minutes – all out sprint on incline to maximum pace you can hold for 2 minutes

1 minute – push absolute maximum speed (this should feel like hell)

10-15 minutes – cool down at an easy pace to bring HR down and breathing should return to normal

This could be done on a flat surface or a treadmill, but I find that a gradual hill works best because my own personal HR increases higher when running on a hill.

The same protocol above can also be utilized on the bike. I recommend using an indoor trainer, but certainly it can be completed outside as well. It is important to maintain a consistent cadence, usually between 85-95rpm (aiming for 90rpm), throughout the test. As you progress through the test protocol, increase your gearing to a harder gear.

Once you have completed your test, download your data. If you have a coach, give the data file to your coach for analysis. If you use TrainingPeaks then you can easily figure out your HR zones through their software. If not, you can do it the manual way. Take your MHR value and multiple it by each zones’ percentage. For example:

MHR = 190

Zone

Minimum Zone

Maximum Zone

Zone 1 (50-60%)

190*0.5 = 95bpm

190*0.6 = 114bpm

Zone 2 (60-70%)

190*0.6 = 114bpm

190*0.7 = 133bpm

Zone 3 (70-80%)

190*0.7 = 133bpm

190*0.8 = 152bpm

Zone 4 (80-90%)

190*0.8 = 152bpm

190*0.9 = 171bpm

Zone 5 (90-100%)

190*0.9 = 171bpm

190*1.0 = 190bpm

Your zones may vary slightly depending on what HR zone calculations are used. Some zone calculations will break Zone 5 into Zone 5a, 5b, and 5c. If you work with a coach, your coach will help you with this. The above is just one method you can use. Once you know your HR zones, you can begin training. Now, if you have a power meter on your bike, then you will probably train using power metrics and thus you must complete a Functional Threshold Power (FTP) test. More on that later this week!

Twitter: bigskytri

Disclaimer: I am a certified personal trainer and endurance sport coach; however, please use common sense when trying out any new exercises. Check with your health care provider before starting any new exercise program. All opinions expressed on this site are solely my own.